Packing and method of preparing it



Jan. 23, 1923. 1,443,311

M. H. COOK. PACKING AND METHOD OF PREPARING IT. FILED AUG. 10, I921.

Inmsvzior Milton J1. Cook m. a ozqmg fliiarmy To all whom it mayconcern:

Patented Jan. 23, 1923.

STATES PATENT OFFICE.

MILTON H. COOK, OF SAN FRANCISCO, CALIFORNIA.

PACKING ANDMETHOD OF PREPARING IT.

Application filed August 10, 1921. Serial No. 491,142.

Be it known that I MILTON H. Cook, a

citizenof the United'tates, residing in the city and county of SanFrancisco and State of California, have invented new and usefulImprovements in Packings and Methods of Preparing Them, of which thefollowing is a specification.

This invention relates to packing members and particularly pertains tocup leathers and the like.

It has been impossible to use rawhide in the manufacture of cupshapedpacking leathers or leather pressed of itself andfwould not remain inshape.

It is the principal object of the present invention therefore to providea packing embodying the desirable. qualities of a) raw hide wearingsurface and the stifi'ening properties of other leathers.

It is also the object of the invention to provide a packing which isreinforced at the heel as shown in the accompanying drawing. This is thepointy at whichmost cup leathers wear out, due to the fact that thefollower forming part of the mould usually presses the leather very thinat thatpoint, weakening-it. The rawhide used in the invention reinforcesthe leather at this point and prevents it from breaking there, and alsoprovides a self-expanding and self-lubricating surface.

The present invention contemplates the use of packing, the frictionsurface of which is formed of rawhide united to a packing of otherleather, such as oak tanned leather, against which heavy-andobjectionable pressures will be delivered.

.The invention is illustrated by way of example in the accompanyingdrawing in which the figure is a view in transverse section through acup leather with which the present invention is concerned.

Referring to the drawing 10 indicates.

inner leather backing preferably formed of oak tanned leather and overwhich backing an outer layer 11 of raw hide leather is applied. In thepast, raw hide has been used for packing material for stufiing boxes andthe like, in which case it has been braided.

In the past, in attempting'to manufacture raw hide packing cups it hasbeen found that due to the soft pliable nature of the raw in variousshapes due to the fact that rawhide is soft.

hide it does not retain its shape and would be ruptured by the excesspressures to which it is subjected. The drawing, therefore, shows theapplication of the invention to the manufacture of cup leathers,although it is to be understood that various other products might beformed along the a the spirit of the present invention.

In making products ofthe character desame general line, withoutdeparting from scribed, it is first desirable to cement the raw hideonto the piece of oak tanned leather. This is referably done by a cementmade from ce luloid dissolved in acetone. After the two leathers andtheir cement have thoroughly dried and set, the leatheris wetted downand pressed into cup shape by any of the usual methods. The formed cupsare then allowed to dry in the mold and, if necessary, the outer layer,which will be raw hide, may then be treated with a desired lubricantwhile the inner layer of oak tanned leather -is impregnated withshellac, parafline, or any other similar desirable substance, the ideabeing to stiffen the backing of'oak tanned leather and to rendertheouter raw hide surface both pliableand oily. This will insure that theacking will be What might be termed sel -lubricating and, dueto its softand pliable nature, will With-. stand pressure more satisfactorily thanmost packing heretofore mad In some instances it might'be founddesirable to first extract the oils from the raw hide by means ofpowerful solvents, such as gasoline, ether or acetone, after which theraw hide is dried and then cemented to the backing of oak tannedleather. In this case it will be necessary to subsequently treat themethod and construction of my invention,

it is to be understood that various changes in the steps of the processand the arrangement of theparts might be made by those skilled in theart without departing from the spirit of the invention as claimed.

Having thus described my invention, what I claim and desire to 'secureby Letters Patent is:

1. A packing material comprising a wearing surface of raw hide, abacking of stiff leather, and a binder interposed between the rawhideand the stiff leather.

- 2. A packing material comprising a backing of oak tanned leather, overwhich is cemented a wearing surface of'raw hide.

3. A packing comprising an inner portion of oak tanned leather or othermaterial to which is cemented an outer layer of raw hide, the back beingrendered stiff and the raw hide being pliable.

i. A method of making leather packing which consists infirst cementing alayer of oak tanned leather to a layer of raw hide, and thereafterimpregnating the oak,- tanned leather to render it stiff.

5. A method of making leather packing which consists in first cementinga layer of oak tanned leather to a layer of raw hide, and thereafterimpregnating the oak tanned leather to render it stiff, and treating theraw hide to render it oily and pliable.

6. A method of preparing leather packing cups which consists incementing layers of oak tanned leather and raw hide together, thereafterwetting the leather down and pressing it into cups; where it is allowedto dry, with the raw hide surface outermost; and then impregnating theinner leather surface to stiffen it.

' 7. A method of preparing leather packing which consists in cementinglayers of oak tanned leather and raw hide, together; thereafter wettingthe leather down and pressing itinto shape where it is allowed to dry,with the raw hide surface outer most; then impregnating the innerleather surface to stiffen it; and then treating the raw hide surface torender it pliable.

8. A method of preparing leather packing, which consists in extractingthe oils from rawhide by solvents, cementing layers of oak tannedleather and the said rawhide together, treating the rawhide to restorethe oils and fats extracted therefrom and then impregnating" the oaktanned leather to stifi'enit.

- MILTON H. COOK.

